Warf, Barney, editor
Springer, 2012
eBooks
edited by Philip L. Wagner, Marvin W. Mikesell
University of Chicago Press, 1962
Buku Referensi
Anderson, Jon, 1973-, Author
Routledge, 2015
Buku Teks
by Les Rowntree ... [and others]
Prenticel Hall, 2008
Buku Teks
Thatcher, W.S., author
English University Press, 1957
Buku Teks